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A301280 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 5
5 16
6 56
7 198
8 699
9 2490
10 8943
11 32355
12 117800
13 431316
14 1587207
15 5867244
16 21777203
17 81127591
18 303240041
19 1136914129
20 4274441613
21 16111746161
22 60873695892
23 230495640009
24 874525192278
25 3324270554675
26 12658405644200
27 48280298159610

[0,0,0,1,5,16,56,198,699,2490,8943,32355,117800,
 431316,1587207,5867244,21777203,81127591,
 303240041,1136914129,4274441613,16111746161,
 60873695892,230495640009,874525192278,
 3324270554675,12658405644200,48280298159610]

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Last modified May 15 03:16 EDT 2021. Contains 343909 sequences. (Running on oeis4.)